NSC 830: ANTIBIOTICS EXAM
QUESTIONS AND ANSWERS 100% PASS
Why does a gram positive stain show up purple - ANS There is a thick peptidoglycogen layer
that takes up crystal violet stain
why does gram negative stain pink/red? - ANS takes up counterstain to appear that color
how many layers does a gram negative bacteria have? - ANS 3- thin peptidoglycogen layer
sandwiched between an inner and outer cell membrane
What color does atypical bacteria stain? - ANS no color
Why doesn't atypical bacteria have a color stain? - ANS there is no peptidoglycogen layer
Minimum inhibitory concentration (MIC) - ANS the smallest concentration of drug that visibly
inhibits growth
antibiotics that inhibits cell wall synthesis - ANS penicillin
cephalosporins
vancomycin
fosfomycin
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, antibiotic that inhibit bacterial protein synthesis - ANS tetracylines
macrolides
lincosamide
mupiricin
oxazolididone
aminoglycoside
MISC method of action antibiotic - ANS fluoroquinolones - DNA
metronidazole
sulfonamides - DNA
nitrofurantion- DNA
which abx are ONLY gram negative - ANS aminoglycosides
metronidazole
which abx are ONLY gram positive - ANS Vancomycin
oxazolidinone
which abx are gram -/+/atypical - ANS tetracylines
macrolides
sulfonamides
are penicillins broad or narrow spectrum? - ANS both
When to use broad spectrum PCN - ANS Acute sinusitis
strep pharyngitis
cellulitis
acute otitis media
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS AND ANSWERS 100% PASS
Why does a gram positive stain show up purple - ANS There is a thick peptidoglycogen layer
that takes up crystal violet stain
why does gram negative stain pink/red? - ANS takes up counterstain to appear that color
how many layers does a gram negative bacteria have? - ANS 3- thin peptidoglycogen layer
sandwiched between an inner and outer cell membrane
What color does atypical bacteria stain? - ANS no color
Why doesn't atypical bacteria have a color stain? - ANS there is no peptidoglycogen layer
Minimum inhibitory concentration (MIC) - ANS the smallest concentration of drug that visibly
inhibits growth
antibiotics that inhibits cell wall synthesis - ANS penicillin
cephalosporins
vancomycin
fosfomycin
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, antibiotic that inhibit bacterial protein synthesis - ANS tetracylines
macrolides
lincosamide
mupiricin
oxazolididone
aminoglycoside
MISC method of action antibiotic - ANS fluoroquinolones - DNA
metronidazole
sulfonamides - DNA
nitrofurantion- DNA
which abx are ONLY gram negative - ANS aminoglycosides
metronidazole
which abx are ONLY gram positive - ANS Vancomycin
oxazolidinone
which abx are gram -/+/atypical - ANS tetracylines
macrolides
sulfonamides
are penicillins broad or narrow spectrum? - ANS both
When to use broad spectrum PCN - ANS Acute sinusitis
strep pharyngitis
cellulitis
acute otitis media
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
